body{width: 100%;height: 100%; margin: 0;padding-top: 10px;}
*{margin: 0;padding: 0;}
.all_bg{width: 800px;height: 600px;margin: 0 auto;}
#allCanvas{position: relative; width: 800px;height: 600px;}
#canvas1,#canvas2{position: absolute;bottom: 0;left: 0;z-index: 1;}
#canvas2{z-index: 0;}
